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Hoping that someone can help me with this - I have spent all day trying to sort it!

In short - I have two screens, at two different resolutions. (Viewsonic VA2431w @ 1920x1080 and HP ZR270w @ 2560x1440). I have attempted to set them up as two twinview screens, using nvidea-settings under nvidia driver version 304.48 on a GeForce 8400GS.

The problem is that only one screen (the Viewsonic) displays anything. The other (HP) is blank with a black screen. It flickers on a X-restart, as though it were expecting signal, but nothing appears.

xrandr shows that the graphics card picks up everything as it should (below)

My xorg.conf follows ...

I would be SO grateful for any help clearing this up!

$ xrandr

Screen 0: minimum 8 x 8, current 4480 x 1440, maximum 8192 x 8192
DVI-I-0 disconnected (normal left inverted right x axis y axis)
VGA-0 disconnected (normal left inverted right x axis y axis)
DVI-I-1 connected 2560x1440+1920+0 (normal left inverted right x axis y axis) 597mm x 336mm
2560x1440      60.0*+
1280x720       59.9  
HDMI-0 connected 1920x1080+0+0 (normal left inverted right x axis y axis) 521mm x 293mm
1920x1080      60.0*+
1680x1050      60.0  
1600x1200      60.0  
1440x900       75.0     59.9  
1280x1024      75.0     60.0  
1280x960       60.0  
1152x864       75.0  
1024x768       75.0     70.1     60.0  
800x600        75.0     72.2     60.3     56.2  
640x480        75.0     72.8     59.9

# /etc/X11/xorg.conf

Section "ServerLayout"
Identifier     "Layout0"
Screen      0  "Screen0" 0 0
InputDevice    "Keyboard0" "CoreKeyboard"
InputDevice    "Mouse0" "CorePointer"
Option         "Xinerama" "0"
EndSection

Section "InputDevice"
Identifier     "Mouse0"
Driver         "mouse"
Option         "Protocol" "auto"
Option         "Device" "/dev/psaux"
Option         "Emulate3Buttons" "no"
Option         "ZAxisMapping" "4 5"
EndSection

Section "InputDevice"

# generated from default
Identifier     "Keyboard0"
Driver         "kbd"
EndSection

Section "Monitor"
Identifier     "Monitor0"
VendorName     "HP"
ModelName      "HP ZR2740w"
HorizSync       44.8 - 88.8
VertRefresh     59.9 - 60.0
Option         "DPMS"
# HorizSync source: edid, VertRefresh source: edid
EndSection

Section "Monitor"
Identifier     "Monitor1"
VendorName     "ViewSonic"
ModelName      "HP ZR2740w"
HorizSync       44.8 - 88.8
VertRefresh     59.9 - 60.0
Option         "DPMS"
# HorizSync source: edid, VertRefresh source: edid
EndSection

Section "Device"
Identifier     "Device0"
Driver         "nvidia"
VendorName     "NVIDIA Corporation"
BoardName      "GeForce 8400GS"
EndSection

Section "Screen"
Identifier     "Screen0"
Device         "Device0"
Monitor        "Monitor0"
DefaultDepth    24
Option         "Stereo" "0"
Option         "nvidiaXineramaInfoOrder" "DFP-1"
Option         "metamodes" "DFP-0: 2560x1440 +1920+0, DFP-1: 1920x1080_60 +0+0; DFP-0:  2560x1440_60 +0+0; DFP-0: 1280x720 +0+0; DFP-0: 1280x720_60 +0+0; DFP-0: nvidia-auto-select +0+0"
Option         "NoLogo" "True"
Option         "ConnectedMonitor" "DFP-0, DFP-1"
SubSection     "Display"
    Depth       24
EndSubSection
EndSection
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